Soluble gilsonite and solution of same



Patented Sept. 5, 1933 UNITED STATES or ies .izador .i. Novak, Bridgeport, Conn., assignor to Ptaybcstos-Manhattan,

a corporation of No Drawing. Original a Serial No. 381,405. Di tion February 24, 193

2 Claims.

This application is a division of my former application Serial No. 381,405 filed July 26th, 1929.

This invention 1 ing a highly soluble gilsonite and a smooth, substantially sediment-free solution of the same.

It is well known that commercial gilsonite is completely dissolve in the ordinary solvents such as gasoline or benzol unless, for instance, it is refluxed with these solvents at a high temperature. This is probably due to the fact that gilsom'te is highly colloidal and therefore, tends to resist complete smooth solution.

With ordinary straight run gasoline and a gilsonite having a melting point of approximately 300 F. (Ball and Ring method) and ash of solved and, therefore, is poorly suited as a saturating material for brake linings for instance, where a considerable proportion of colloidal material is left on the surface when impregnation is attempted.

I have found that, by melting gilsonite such as described aboveand holding it slightly above the temperature at which it is comparatively fluid, which may be say, 325-400 F2, for a period or" one half hour, more or less, the gilsonite is renzol without material lowering of the original melting point. As a matter of fact, in most cases, no lowering is observed. After cooling, I find that such a previously melted gilsonite goes easily and quickly into solution in gasoline and benzol or other similar or related solvents, leaving no appreciable residue except the inorganic matter which was contained.

pplication vided and this applica- Inc., Bridgeport, Conn,

New Jersey July 26, 1929,

Serial No. 518,028

After months of standing, such solutions in gasoline have shown no appreciable sediment and are smooth and homogeneous. Further, it quickly and thoroughly saturates, for instance, woven asbestos-covered Wire tape without leaving 69 sediment on the surface indicating that the colloidal characteristics of the untreated gilsonite have been very much reduced.

By the term gilsonite I wish to indicate asphaltites having a fusing point over 250 F., and a specific gravity between 1.05 and 1.12, fixed carbon 10-25%, solubility in carbon bisulfide greater than 96%. This is intended to include certain of the glance pitches which are so close 70 in physical properties to true gilsonite that they are or may be used for the same purpose.

it is customary to make certa1n varnishes by combining gilsonite with natural gums and drying oils at high temperatures whereby the gilsonite becomes truly soluble, but the intent of this invention is to produce a truly soluble gilsonite per se and not a combination with oils.

1 claim as my invention:

1. A product derived from gilsonite by subjecting said gilsonite to heat at a maintained temperature slightly above its boiling point, said product being substantially equal in volume and melting point to said gilsonite and characterized by a marked reduction in colloidal characteristics.

2. A product derived from gilsonite by subjecting said gilsonite to heat at a maintained temperature slightly above its melting point, said product being substantially equal in volume and melting point to said gilsonite and characterized by complete solubility in gasoline and a marked reduction in colloidal characteristics.

IZADOR J. NOVAK. 

